Hello, Codeforces!

We are happy to invite you Baozii Cup 3, which will take place on Jan/25/2026 08:00 (Moscow time).

You will have $$$5$$$ hours to solve $$$13$$$ problems, including at least one interactive problem.

This is a team contest following ACM/ICPC rules, with teams of up to $$$3$$$ members. The penalty for an incorrect submission is $$$20$$$ minutes.

The standings will be frozen for the last $$$60$$$ minutes of the contest.

Most problems are created and prepared by me, with help from Bronya_H and zeemanz.

We would like to thank:

• MikeMirzayanov for creating the fantastic CodeForces and Polygon platform.

• SSerxhs, SATSKY_2025target_LGM, -WIDA-, fatalerror, and itsiftikar02 for testing the round and providing valuable feedback.

• -firefly- for generously letting me copy his Soy Cup #2: Vivian announcement.

• fatalerror for preparing the invitation letter.

• Tobo for being the biggest ^(*￣(oo)￣)^ in history.

• You for participating in the round!

Registration

If you are living in China or have a WeChat/QQ account, you may register by filling in this form. Otherwise, you may register by filling in this form. Please do not fill in both forms.

Notes

• You may attempt past contests at Baozii Cup 1 and Baozii Cup 2.

• If you have any queries regarding the contest, please send a private message on either Codeforces or WeChat.

Good luck and have fun!